Minutes: XRI TC Telecon 2-3PM PT Thursday 2009-09-17

["Drummond Reed" <drummond.reed@cordance.net>]

Following are the minutes of for the unofficial telecon of the XRI TC at:

Date:  Thursday, 17 September 2009 USA
Time:  2:00PM - 3:00PM Pacific Time (21:00-22:00 UTC)

ATTENDING

Will Norris 
Drummond Reed
Markus Sabadello 
Eran Hammer-Lahav
Breno de Medeiros


AGENDA

1) LINKED XRD PROCESSING ISSUE
	
http://www.oasis-open.org/committees/download.php/34072/xrd-1.0-wd06.html

The one outstanding issue holding up a Committee Draft at this point is the
one raised on the mailing list by Eran: processing of linked XRDs and
"includes/replaces" semantics.

It turns out Eran and Drummond and Wil all had different assumptions about
how linked XRDs would be processed. Drummond thought that every linked XRD
is an "equally valid descriptor" of the described resource, and that all
information in the linked XRD (including Alias, Types, etc.) should be
considered IF a linked XRD needs to be processed.

Eran pointed out this would require that XRD consumers follow every linked
XRD to determine if there were any required types. Eran brought up the use
case of "full delegation" of an XRD and pointed out that #see-also links do
not actually accomplish this because not all elements of the linked XRD are
processed - only the <Link> elements in the linked XRD are processed.

The problem with #see-also links is that since they are "partial includes",
they require complex processing on behalf of an XRD library. You can't, in
Eran's words, "just give the XRD to an XML parser" and start inspecting the
tree. Instead you have to go through the process of checking and building a
composite XML document first.

The attendees on the call discussed it at length but could not come up with
a compelling use case for why we should not drop #see-also in favor of
#replace because the latter produces a significantly simpler processing
model. The best case for keeping #see-also is "local override" of a
delegated XRD, e.g., the owner of a blog keeping a local XRD that describes
local services and then delegates to a linked XRD for everything else.

[Note: Drummond's done more thinking about this since the call; see his
email to the list about this option.]

Eran believes #replace should be a link for the same reason #see-also was,
i.e., it enables using all the same semantics and trust mechanisms.

#ACTION: ERAN AND WILL to put this into Working Draft 07.


2) SCHEDULE FOR COMMITTEE DRAFT 01 VOTE

The consensus was to put together a proposed final Working Draft 07, push it
out as soon as it is ready, and make it a Last Call before a vote.


3) OTHER LINK HEADER/HOST META/LRDD STATUS/ISSUES

	http://tools.ietf.org/html/draft-nottingham-http-link-header
	http://tools.ietf.org/html/draft-nottingham-site-meta
	http://tools.ietf.org/html/draft-hammer-discovery

Eran sent a link to the list to the new draft -- hopefully final -- of site
meta:

	http://www.ietf.org/id/draft-nottingham-site-meta-03.txt 


4) XRI SYNTAX 3.0 WORKING DRAFT 03 STATUS/ISSUES

Drummond caught a bad cold prior to last week's trip to DC so no progress on
this yet.


5) NEXT CALL

Next week at the regular time.